| 摘要 |
PROBLEM TO BE SOLVED: To enable a serviceman to switch a program by a simple method, in an apparatus not having a switch to activate a maintenance and inspection program in order to prevent an incorrect user operation.SOLUTION: A program switchover system includes: a power voltage input unit to which a plurality of DC voltage values are input from one or more DC power supplies; a level shift unit for converting each voltage level of a plurality of output voltage values from the power voltage input part: a control unit for changing a program activated according to the plurality of output voltage values output from the level shift unit; and a protection unit for protecting the control unit from the plurality of voltage values input to the control unit. |
